Oumar Bagayoko (born September 19, 1975) is a retired Malian footballer.
Bagayoko played for Djoliba AC and briefly in Austria Wien. He later played in Kuwait before starting a career in Greece. Here he played for Athinaikos F.C. in the Greek Beta Ethniki, later for Thrasyvoulos F.C. and Chalkida-Lilas F.C. in the Greek Gamma Ethniki.
Bagayoko made several appearances for the Mali national football team, including a 2000 African Nations Cup qualifier and a 2002 FIFA World Cup qualifier against Libya.